Many developers are often asked by project owners to give time estimates for features or bug fixes. But how many developers have the ability to provide project owners a reasonable estimate? Many developers will just follow irrational formulas or arbitrary methods to create a number that is not only wrong, but costly. "Stop Multiplying by 4" will teach developers of all skill levels easy techniques to provide accurate estimations. We will start with a small calibration exercise to find out how good you are. We will then go over procedures to improve accuracy . At the end of the talk, you will possess the skills to get you started on improving the certainty of your estimates.